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JOSEPH'A. MILLER, 0F NEW YORK, N,

Letters Patent'No. 104,979, (Za-ted July 5, 1870.

STEAM-GENERATOR.

The Schedul; referred to in these Letters Patent and making part of the saune.y

by declare that the following is a fullc1ear, and exact description thereof', which will enable others skilled in the art to make and use the same, reference being had tothe accompanying drawing forming part ofthis specification, in`which Figure 1 represents a sectional perspective view of myimproved steam-generator.

.'Figure 2 is a vertical longitudinal section ot' the same.

Figure 3 is .a vertical transverse sect-ion of' the same, taken on the plane of the line :v rv, iig. 2.

Figure 4 is a vertical transverse section of the same, taken on the plane ofthe line y y, fig. 2. l

Figure 5 is a vertical transverse section of the same, taken ou the plane of the line z z, fig. 2.

Similar letters of reference indicate corresporuling parts.

. This invention has for its object to largely increase lthe heating surfaces of steam-boilers, with a view of obtaining greater evaporating power in a boiler ot' comparatively small dimensions, and alsoto increase the evaporatin g surface of a comparatively small quantity of water. y l

My invention consists chiefly in constructing the roof of the ire-chamber of a series of U-shaped chalubers, which are traversed by short tubes, through which the products of combustion can pass. Water is contained in these chambers, and at the upper parts of the same, in connection with that inthe hol-v low sides of theboilcr, and is therefore in these chambers exposed Vto a very considerable heating-surface. i

The invention also consists in the use of vertical transverse partitions'arranged in the upper part of the boiler, above the aforesaid chambers, for the purpose of detaining the water and insuring a slow forward motion. v

AA are the sides of the boiler, made in forni of flat, upright boxes, whose outer sides a a are, by the rounded covering plate l) of the boiler, connected with each other. Their inner sides, c, do not extend up to the covering-plate, but terminate a short distance below the water-line d.

Between the side boxes A A, and below the upper ends of their inner sides c, are arranged, in the boiler, a series ot' U-shaped chambersor units, B B, which 'are made each of a continuous sheet ot' metal, bent in such manner that they form water-traps suspended into the fire-chamber of the boiler, and so that spaces e e, to let the gases envelop them, are formed between the same. Therefore cach side of cach U 'tubes G.

shaped chamber B is turned up from the lower end, and then outward, to form the top of the space c.

The several chambers are, by flanges ff, that are. formed at their upper ends, and suitable bolts, 85e., connected with each other, thel upper ends of the said flanges f being about in line with the upper ends ot the sides c.

Any suitable number of chambers B B, of suitable dimensions, are secured side by side to form theV heating-surface of the boiler.

In about the middle ot' the boiler I prefer to extend one chamber, down Vfar euongllyto form' the bridge wall of the boiler, as shown, and behind the ,bridgewall I prefer to gradually prolong the chambers B,

'so that their lower parts will be below the action of caused to pass around and between the several chambers B, and also through the same, fi. e., through the Therebya large heating-surface is provided iu a small space, and the combustion of' gases will be more complete, not only ou account of the largerarea obtained'for the combustion, but also be-' cause the gases are detained and become iutermingled and disturbed as they pass from the tubes to the spaces c, and cioe tersa.

The momentum with which the gases Vmove is de stroyed whenever they issue from the tubes into Athe much larger spaces e. Thus, in a comparatively short boiler, time is gained to utilize to theirffull extent the heated gases before they 4reach the chimney.

In order to still more completely utilize the heat, I feed the water into the rear compartment B, to let it overliow from lthe same into the next chamber, B,-v

in front of it, and so on, letting it gradually but slowly move forward. The water is thereby gradually heat-ed as it progresses toward the front or hottest part ot'A the boiler.

D D are vertical transverse plates, arranged in the upper part ot' the boiler, to extend from 'side to side ofthe same.

One plate, D, isprovided for and above each chanlber B, and extends above and below the water-line,

assist in precipitating impurities, so that the water does not only become heated before it arrives at the hottest part of the boiler, but arrives there also perfectly pure, preventing thereby all incrustation of the diately connected with the large chamber B', which forms the bridge wall, as aforesaid, when all sediments will collect at the bottom of said chamber B',

whence they can be readily removed.

By all the aforesaid arrangements it will be seen the water receives a considerable evaporating surface, while its weight and actual quantity 'is considerably less than in boilers of larger size, to produce a'surface of equal extent. Consequently. steam will be much more rapidly produced. Y

By means of the transverse chambers B and plates D, the strength of the boiler is materially increased without adding to its weight or bulk, and no stays or braces are required, except perhaps such as are needed for the root and sides of marine boilers.

The chambers B may be of suitable lehgth. Fur naccs can, therefore, be used of any suitable size, withont fire-boxes or partitions. Y

The cleaning of the interior of the boiler and of the heating surfaces-presents no difficulties.

The tubes C beingr all in line, can be readily cleaned by removing the cap of the front or rear chamber.

'lhe tubes being short, their expansion and contraction is imperceptible, and will not injuriously affect the other parts ot' the boiler.

If the spaces e are wide enough, it is easy to remove and repair the tubes C.

'This system of construction is peculiarly valuable for locomotive and agricultural steam-boilers, as all parts of the heating surface are entirely covered with water, whatever be the inclination of the road, lthe chambers B holding their contents separately.

If the inclination is very considerable Vthe feedwater will be forced in at the highest part of the boiler, and thence overflow to the several compartments.

Having thus Vdescribed my invention,

I claim as new and desire to secure by Letters Patent-U l-. A series of curved pockets, B, closed below and openabove to a common water-space, as set forth. s

2. A boiler, having the outer sides a, a extending up to form roof '11, and inner sides c c, extending nearly up. to the water-line, in combination with a series of chambers or pockets, B B, formed of continuous sheet y metal, and the' spaces e e arranged alternately bctween thelatter, all as shown and described.

3. lhe plates D D, arranged transversely in the boiler, in combination .with vthe pendent chamber B, as specified. i

4. The combination of the pockets B, spaces e, and

tubes O, `constructed and arranged as and for the l purposespecificd. i

5. The combination of scumming plates D, Vto precipitate the impurities, with the spaces and holes for the collection and discharge thereof', all as shown and Witnesses v WM. A. KIMBALL, J. A. GRosvENoR. 

